Fig. 2From: Electron-transport properties of degenerate ZnSnN2 doped with oxygenInfrared reflectance spectra of ZnSnN2−xOx epilayers with x = a 0.055, b 0.069, c 0.074, and d 0.079. The results of least-squares fitting using the modeled dielectric function are represented by solid lines. All the data are included in Additional file 6Back to article page