a portion of the region made of the material comprising copper as the main ingredient is in {HEAD ~ contact} with {TAIL ~ the insulative diffusion barrier layer}, 
with
a portion of the region made of the material comprising copper as the main ingredient is in { HEAD ~ contact } with { TAIL ~ the insulative diffusion barrier layer } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH