It can also create a quantum wire superlattice by sandwiching {TAIL ~ a thin CTSL layer} between {HEAD ~ two wider band gap layers} 
It can also create a quantum wire superlattice by sandwiching { TAIL ~ a thin CTSL layer } between { HEAD ~ two wider band gap layers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD