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A layer is the deposition of molecules on a substrate or base (glass, ceramic, semiconductor, or plastic/bioplastic) .
High temperature substrates includes stainless steel and polyimide film (expensive)  and PET (cheap).
A depth of less than one micrometre is generally called a thin film while a depth greater than one micrometre is called a coating.
A web is a flexible substrate.
See also 
- ^ http://www.ipe.uni-stuttgart.de/index.php?lang=ger&pulldownID=12&ebene2ID=18&ID=3394