Twin leads to the reorientation of the crystal. In case of tensile twin of Mg, the
misorientation of mother and daughter is about 87.3 degrees. However, that does not mean
that there was huge translation in atom array. Only a small atomic translation can change the
crystallographic orientation. Actually, although the contribution of twin itself to plastic strain
is not so tremendous in case of polycrystalline, twin can play an important role because the
twin modifies the crystallographic orientation of mother to the dislocation slip favored
orientation. In case of monocrystalline magnesium, due to the absence of grain boundary,
almost all volume is twinned, once twin occurred. Therefore, the influence of twin is much
larger in single crystal