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A group theory method for deriving a complete and non redundant canonical set of basis functions adapted to the description of Orientational Disorder In (plastic molecular) Crystal (ODIC) is developed. The method takes full advantage of the properties of the site and molecular symmetry groups. In particular, it is shown that, when both groups contain improper rotations, the canonical basis includes functions which have not been previously considered.
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Yvinec et al. (1980) studied this question.
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