“…GBs jump (53,58,62), reverse direction (57,58,62), bulge (57), restructure (61), and oscillate between positions (64,65). Often these movements are attributed to triggering events (58) that involve other vicinal defects such as stacking faults (59), twins (58), TJs (53,62), and free surfaces (53,62,65). These behaviors have been used to support both cooperative shuffling and disconnection-mediated mechanisms, as discussed in Section 2.2.…”