| http://www.w3.org/ns/prov#value | - The material for the second (hinge) layer can be the same (e.g. silicon nitride) as the first layer or different (e.g. any suitable material such as silicon oxide, silicon carbide, polysilicon, or Al, CoSiNx, TiSiNx, TaSiNx or other ternary and higher compounds) and can be deposited by chemical vapor deposition like the first layer.
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