<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">hello <br></div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span id="ydp1cc2e260result_box" lang="en"><span>I tried Berrypi's accompanying code and exactly the GaN tutorial4.</span> <span>my question is how to create the GaN_W structure.</span> <span>because I see that it is important if I want to calculate the polarization or phase of another structure.</span> <span>Thank you</span></span></span><br></div></div></body></html>