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