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An optical study of the smectic-O films which float on the free surface of droplets of racemate MHTAC [1(methyl)-heptyl-terephtalidene-bis-amino cinnamate] in the isotropic phase, is presented. It allows us to elucidate the herringbone structure of the molecules in this original liquid-crystal phase, and to estimate the dipole moment ({~}5×{}10^-3 D) that the molecules bear in the first smectic layer in contact with the air.
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Galerne et al. (1990) studied this question.
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