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