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This paper derives the expressions for the ordering degree and the modulation factor of A and B atoms in AxB1-xC epilayers of teary Ⅲ-Ⅴ semiconductor alloys. Using these expressions, it identifies quantitatively the alteating atom-enhanced planes, compositional modulations, atomic ordering degree on the group-Ⅲ sublattices and the fine structure of NMR spectra.