Under constant GaCl and NH3 partial pressures , reducing the growth temperature alters {HEAD ~ the growth morphology} from a smooth, hillocked structure to {TAIL ~ a pitted surface morphology} and eventually to polycrystalline growth 
Under constant GaCl and NH3 partial pressures , reducing the growth temperature alters { HEAD ~ the growth morphology } from a smooth , hillocked structure to { TAIL ~ a pitted surface morphology } and eventually to polycrystalline growth
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH