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Abstract
Coatings or surface changes produced by exposure to r.f. plasma's have a profound effect on liquid crystal alignment. Oxide type surface (SiO2, SnO2, In2O3) produce parallel alignment. fluoride type surface (F. etched glass, fluorocarbon polymers) produce perpendicular alignment. ϵ(H) data are analyzed using conventional theory. The theory fails for mixed aligned cells but shows good agreement for all-parallel and all-perpendicular alignment.