| http://www.w3.org/ns/prov#value | - The remaining layers are optically thick and have an optical thickness of not less than 0.45 ??m, or are a combination of optically thick and optically very thin and have optical thicknesses of not more than 0.09 ??m or not less than 0.45 ??m, respectively, where the optical thickness is defined as the product of the individual layer thickness times the refractive index of the polymeric material w
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