.9 (14.6) eV for the stable phases of Ga 2 O 3 and In 2 O 3 , respectively. We apply the concept of transferability of these parameters (CUT, and A) to other polymorphs (of the same oxide) to predict approximate QP electronic structures. This approach follows the principle of transferability commonly used for atomic pseudopotentials. We tested the validity of this concept by optimizing the three parameters A, CUT (group-III), and CUT