A liquid-crystal cell treated for homeotropic alignment with different surfactants at the two surfaces was subjected to an electric field E in the plane of the cell. The differential optical retardation {δ}{α} was found to be linear in field over a frequency range 10100 000 s^-1, where d({δ}{α})/dE{∝}ω^-1. A model is proposed that explains this result and facilitates the determination of the anchoring strength coefficient W. {} 1996 The American Physical Society.
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Kang et al. (1996) studied this question.
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