| http://www.w3.org/ns/prov#value | - The substrate 2 may also be a card-form recording medium in addition to the disc shape.Dielectric layers 4 and 6Dielectric layers 4, 6 are made of one or more of dielectrics, for example, an oxide, a nitride, or a sulfide of SiO.sub.2, SiN.sub.X, ZnS, or the like, or a metallic compound such as various kinds of a metallic oxide, and a metallic carbide, anda mixture thereof, e.g., ZnS--SiO.sub.2, b
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