The molar ratio of 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 {HEAD ~ this ratio} in {TAIL ~ the compound film} may be reduced to greater than about 0.80 and less than about 1.0 
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The molar ratio of 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 { HEAD ~ this ratio } in { TAIL ~ the compound film } may be reduced to greater than about 0.80 and less than about 1.0
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 HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH