4) a third heating and cooling stage wherein a reducing gas flows over {HEAD ~ the substrate} to form {TAIL ~ metal deposits}; and 
4 ) a third heating and cooling stage wherein a reducing gas flows over { HEAD ~ the substrate } to form { TAIL ~ metal deposits } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH