The dependence of the hBN band structure, shown in Fig. for 1L, on the number of layers is also an important consideration, given the nature of the present study. While little experimental information has so far been offered on this matter, our DFT calculations reveal a strong dependence of the band gap energy on the number of hBN layers, changing from 6.1 eV for 1L to 5.6 eV for 6L, as shown in Figure . However, this ~0.5 eV difference originates from the decrease in the CBM with the VBM remaining nearly constant. We therefore do not expect the hBN band gap dependence to affect the tunneling processes here.