| http://www.w3.org/ns/prov#value | - A protective layer 18 is coated over metal layer 17 as heretofore described to a thickness of (A/4) where n is an integer formed of a transparent material such as A1 0 Recording by laser beam vaporization of the metal layer takes place through the transparent protective layer 18, while the half-wave heat reflective layer 15 provides protection for the substrate 16.
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