| http://www.w3.org/ns/prov#value | - The first reflective layer 46 and the second reflective layer 50 are formed of a reflective material, such as aluminum, gold, or a dielectric, such as is described in U.S. Pat. No. 5,540,966, entitled Dual Layer Optical Medium Having Partially Reflecting Thin Film Layer, issued Jul. 30, 1996, the entire content of which is herein incorporated by reference, having varied degrees of reflectivity,
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