Analysis has been carried out by computer simulation. Two kinds of twinning structure on the (001) plane have been revealed, one of which is written as (hhc)h(chh) by the c-h order of the compound layers and the other is written as (hhc)hhh(chh). Characteristic line defects have been found on the (101) plane of the hexagonal cell of the obverse structure with stacking sequence ABC prime BCA prime CAB prime and on the (102) plane of the reverse structure AB prime A prime CA prime C prime BC prime B prime . A structural model for the middle part of the (102) line defect is proposed.
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