Abstract
The angle between the nematic director and an aligning surface in contact with a nematic phase is of importance in defining the mechanism of surface alignment of liquid crystals. A new and simple optical method of determining this tilt angle is described, and measurements are reported on a number of homologues of the series 4-n-alkoxy- and 4-n-alkyl-4'-cyano-biphenyl liquid crystals aligned by obliquely evaporated films. The tilt angle is found to depend in a systematic way on the liquid crystal material and also on the composition of the aligning layer.
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