A bulk GaN layer is grown on {TAIL ~ the transitional layer} by {HEAD ~ HVPE} under the substantially 2D growth mode 
A bulk GaN layer is grown on { TAIL ~ the transitional layer } by { HEAD ~ HVPE } under the substantially 2D growth mode
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH