| http://www.w3.org/ns/prov#value | - The thickness of the outer layer(s) is selected independently of the other layers and is preferably within the range from about 0.1 to 10 ??m, in particular from about 0.2 to 5 ??m, preferably from about 0.3 to 2 ??m, and outer layers applied on both sides may be identical or different in terms of their thicknesses and compositions.
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