| http://www.w3.org/ns/prov#value | - The first layer period Ta1 and the second layer period Ta2 could be identical or different as well (in the simplest case Ta1=n*Ta2 or Ta2=n*Ta1, where n is an integer), and the offsets Xa, Xb, Xc, and Xd are each produced by offsetting the structures with the period Ta1 of the grating structure Ga1 with respect to the structures with the period Ta2 of the grating structure Ga2 by the
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