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The elastic properties of cadmium arachidate films, 11 to 401 monolayers thick, prepared on molybdenum and glass substrates by the Langmuir-Blodgett dipping technique, have been investigated by Brillouin scattering. Measurements of the dispersion of the guided acoustic waves with film thickness indicate an anomalously small ratio of the shear to the compressional elastic constants. Evidence for molecular reorientational fluctuations in the depolarized spectrum was also observed.
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Zanoni et al. (1986) studied this question.
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