{HEAD ~ The molar ratio} of {TAIL ~ Group IB} to Group IIIA elements in the source material may be greater than about 0.80 and less than about 1.0, or substantially greater than 1.0, in which case this ratio in the compound film may be reduced to greater than about 0.80 and less than about 1.0 
{ HEAD ~ The molar ratio } of { TAIL ~ Group IB } to Group IIIA elements in the source material may be greater than about 0.80 and less than about 1.0 , or substantially greater than 1.0 , in which case this ratio in the compound film may be reduced to greater than about 0.80 and less than about 1.0
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH