| http://www.w3.org/ns/prov#value | - In the given embodiment of the invention, the mirror plates are a multi-layered structure, which comprises a SiOx layer with a preferred thickness around 400 ???, a light-reflecting layer of aluminum with a preferred thickness around 2,500 ???, a titanium layer with a preferred thickness around 80 ???, and a 200 ??? TiNx layer.
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