| http://www.w3.org/ns/prov#value | - where ??D is a distance between a first face of the second layer and a surface which 1) is within the second layer, 2) is substantially parallel to the first face of the second layer, and 3) is the surface farthest from the first face of the second layer for which the following relationship is satisfied for at least one of the alkali/alkaline-earth ions which the glass or glass-ceramic contains:
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