Considering dislocations of pure screw or edge character
limits the possible dislocation–GP zone interactions
to four orientations since GP zones only form on
{1 0 0}-type planes. We classify these orientations by
the dislocation character, i.e. screw or edge, and the angle
between the dislocations’ Burgers vector and the
plane of the GP zone, i.e. 0 or 60