The phrase "as an extra layer" is correct and usable in written English.
It can be used to describe an additional component or feature that enhances or adds to something already present.
Example: "The software includes a security feature as an extra layer to protect user data."
Alternatives: "as an additional layer" or "as a supplementary layer".
With banking sites there is often additional software it suggests a user can download as an extra layer of detection.
It's all very serious, but as an extra layer of theatricality, it's fun and adds to the intrigue.
In her home in Gilo, with her shutters pulled low as an extra layer to guard against bullets, Tami Reuveni sat on her couch and waited.
That stirred security concerns in Warsaw and Prague, where the missile shield is seen as an extra layer of American guarantees of security because it would entail the physical presence of U.S. troops in each country.
The resulting files were transferred to the GNM Archive's digital repository and it is these versions that are now accessible to researchers, although the original tapes have been retained in the archive storerooms as an extra layer of precaution.
Our soloist emerges in white: a T-shirt, miniskirt and platform shoes recalling her 1990s clubby imperial phase, a UV-activated cloak and mask adding a theatrical dimension over them, as well as an extra layer of protection.
The perception filter, they tell us, was originally intended as just an extra layer of security, since the time machine also has a "chameleon circuit" to make it match its background.
Shooting only with available light in frigid temperatures (a feat that bookends his work in the very hot Anza-Borrego Desert State Park in the unreleased "Last Days in the Desert"), Lubezki brings, as always, an extra layer of soulfulness and grace to his images.
The majority were born to male-female couples in which one partner later came out as gay (adding an extra layer of complexity and heartbreak), rather than being planned via adoption, sperm donation or in vitro fertilization.
That's in comparison to virtualization, which as written in InfoQ, has an "extra layer of isolation that the hypervisor brings".
But bloc votes are not expected to be as strong as in previous Fifa elections, adding an extra layer of unpredictability.
