Fig. 4.. (a) Six possible atomic arrangement direction ${{\overset{\scriptscriptstyle\rightharpoonup}{h}}_{i}}$ of a half of excess atomic plane of edge dislocation in 2D triangle lattice plane; (b) Six possible direction of Burgers vector ${{\overset{\scriptscriptstyle\rightharpoonup}{b}}_{i}}$ of edge dislocation corresponding to the atomic arrangement direction${{\overset{\scriptscriptstyle\rightharpoonup}{h}}_{i}}$. (c) Six possible directions of the composite vector Bi=bi+bi+1 and the directions of bi. The solid line arrow corresponds to Bi vectors, while the dotted short arrow corresponds to bi vectors. The direction of the Bi is rotated by 30° with respect to the direction of bi. The number in the Fig. 4(c) correspond to the order i in bi and Bi.