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