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We report the results of resonant x-ray diffraction at the sulfur K-edge performed upon free-standing films of a thiobenzoate liquid-crystal compound. Our data provide the first direct structural evidence of distinct periodicities in several chiral Sm-C phases, including 2-layer, 3-layer, and 4-layer superlattices in Sm-CA*, Sm-CFI1*, and Sm-CFI2*, respectively. In Sm-C_α*, periodicity incommensurate with the layer spacing was detected. The racemic compound version was also studied. The results are consistent with a ``clock model'' of the Sm-C* variant structures.
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Mach et al. (1998) studied this question.
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