The phrase "a first layer" is correct and usable in written English.
It can be used when referring to an initial or foundational layer in a process, structure, or concept.
Example: "In the construction of the building, a first layer of insulation was applied to enhance energy efficiency."
Alternatives: "an initial layer" or "a foundational layer".
A: First layer: we'll give you idea of what other people have done on dates.
Mobile devices provide a first layer, the internet of things will take this even further.
The painter checks in with the customer first, then, if everyone's happy, adds a first layer of colour.
A first layer constituted of a rigid protective gel ensured good mechanical properties and gas exchanges.
By now, Republicans had hoped to put away a first layer of Democrats and set their sights on a second tier of incumbents.
The cell is formed in layers, including a first layer that can later be dissolved chemically, so the finished cell can be peeled away from the silicon wafer.
A first layer was deposited directly onto stainless steel substrate by plasma spraying of a coarse TiO2 powder.
Considering the negative charge of the rHBsAg, as a first layer we adsorbed the cationic polymers protamine (PR) and polyarginine (PARG).
(Hinton now splits his time between the University of Toronto and Google). A first layer of neurons will learn how to distinguish basic features, say, an edge or a contour, by being blasted with millions of data points.
Abstract: According to aspects of the present invention, a cartridge assembly for transporting fluid into or out of one or more fluidic devices includes a first layer and a second layer.
In these auctions, the waste is often sold to a first layer of contractors who promise to handle it appropriately, only to have the most toxic portion subsequently sold to subcontractors who move it around as they wish.
