“…Therefore, if lattice distortion is induced in the in-plane direction (u 1 = (x, 0, 0)), then I(q + Δq x ) increases but I(q+Δq z ) does not, so peak broadening occurs along the x direction. In the case of TDs, in-plane distortion, u 1 , can be induced by edge-type dislocations but not by screw-type dislocations 30,31 . Therefore, the type of TD in the epitaxial layers affects the direction of lattice distortion, so the RSM FWHMs change asymmetrically.…”