Abstract
Abstract According to the definition by Dornberger-Schiff (1982), a member πo of a given family of polytypes interpreted as an OD family, is called an MDO polytype, if it is impossible to construct another polytype π1 of the same family, in which the kinds of n-tuples of consecutive layers for some numbers n constitute only a selection of the kinds of n-tuples contained in πo. The meaning of this definition, its comparison with the current rules for the derivation of simple polytypes as well as some pitfalls caused by neglecting partial symmetry, is explained by using SiC, pyrophyllite and a hypothetical structure, as examples.
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