Figure 3.
Structural models. (a) The schematic model from the MgO substrate to the nonpolar ZnO surface layer. (b) The schematic model from the MgO substrate to the polar ZnO surface layer.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.