Table 2
VBOs calculated for the Ga2O3/GaN heterostructure using different combinations of the XPS core levels
	Ga3d	N1s
Ga3d	1.54	1.47
O1s	1.25	1.32

The errors in the VBOs are ±0.08 eV.

Wei et al. Nanoscale Research Letters 2012 7:562   doi:10.1186/1556-276X-7-562