New x-ray diffuse scattering results are presented that show that the layer structure in stage-2 alkali-metal graphite intercalation compounds is almost commensurate with a (√7×√7)R19.11^∘ superlattice. Through model calculations, features of the in-plane diffraction patterns are associated with a hexagonal array of discommensurations oriented parallel to the real-space graphite [110] directions. The array appears to be disordered down to at least $T=10$ K. Several previously unexplained results are understood through our model.
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Clarke et al. (1981) studied this question.