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. 2015 Sep 16;5:14116. doi: 10.1038/srep14116

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The superlattice is composed of two FCC-lattice layers, A (red) and B (green). The two layers have identical thickness W/2, where W is the replication period. Here, we measure W as the number of monolayers of the lattice structure, e.g., W = 8 in the displayed case. The distance between adjacent monolayers is a/2 for the perfect FCC structure, where a is the lattice constant.