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