The phrase "a complementary layer" is correct and usable in written English.
It can be used in contexts where you are describing an additional layer that enhances or completes something else, such as in design, architecture, or technology.
Example: "The new software update adds a complementary layer to the existing system, improving its functionality."
Alternatives: "an additional layer" or "a supplementary layer".
The measured fluid velocity showed a complementary two-layer structure with the upper layer being dominated by a pair of counter-rotating vortices that kept this portion of the liquid well mixed and transferred heat from the hot pool wall to the pool center, while the flow in the lower layer was uniformly low in value and vertical.
Its darkly sugared, inherently spicy nature contributes what is, to my taste, the most complementary layer of additional flavor, along with the requisite alcohol.
For its part, the BAN architecture was also divided in two complementary layers (see Figure 3 for an explanatory diagram).
The novelty of our approach lies in the three complementary layers: preprocessing, syntax-based attribution, and semantic-based attribution.
Formal policy to guide how employees can use social media sites is not enough, and complementary layers are needed: education starting at elementary school, interactive and adaptable training and innovative technology means.
Briefly, spherical polystyrene (PS) nanoparticles were coated with complementary layers of poly allylamine hydrochloride) (PAH) and bovine serum albumin (BSA) until 4 bilayers, (PAH/BSA)4, were formed on the template PS particle.
The site is built upon Wikipedia's platform with the idea of being a complementary media and discussion layer, similar to the way Friendfeed enables discussions about tweets originating from Twitter.
By contrast, organic heterojunctions introducing a suitable electric field or potential step, achieved by pairing the organic with a complementary metal or semiconductor layer, exhibit relatively high exciton dissociation efficiencies.
The bore front shows a horizontal extension greater than 1000 km, and observed in the airglow layers as a complementary brilliance between the three emissions.
In the case of multi-layer organoclay reinforced PAI films, the drying behavior of each individual layer was tracked and a complementary drying model is proposed.
