Anthracene single crystals have been deformed by cleaving and by bending. In both cases, immobile tilt boundaries approximately perpendicular to the basal planes were observed. These boundaries were slightly asymmetric with respect to the basal planes on either side. It is believed that the boundaries consist mainly of mobile dislocations with Burgers vectors in the basal plane. The asymmetry of the boundaries is thought to be due to the incorporation of a few dislocations whose Burgers vectors lie in the other planes; these dislocations also serve to pin the boundary.
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Robinson et al. (1967) studied this question.
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