The thermal fluctuations of freely suspended smectic-A films have been studied with diffuse x-ray scattering. Using a (2+2) scattering geometry at a synchrotron source the spectral dependence of the displacement-displacement correlation function has been determined from mesoscopic to molecular dimensions. At long in-plane length scales the fluctuations of the smectic layers were found to be conformal; i.e., all layers of the film fluctuated in unison. At decreasing length scales conformality was progressively lost, starting between the top and bottom layers of the film.
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Mol et al. (1997) studied this question.
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