On the basis of investigations of the twin structure of dendrites and webs, it was deduced that changing a twin structure that was formed by coherent twinning planes of the first order could give rise to defect formation. Rules were derived for matching crystal lattices in the region of twin structure variation. Two-dimensional atomic models for twin structures which varied within the crystal bulk were considered. The models incorporated both coherent and additional twin boundaries, and also second-order twin boundaries. It was assumed that the formation of misfit boundaries, interstitial stacking-fault defects, and partial dislocations was very probable in such crystals.

M.J.Dashevskii, R.V.Kibizov: Kristallografiya, 1996, 41[3], 522-33 (Crystallography Reports, 1996, 41[3], 494-504)