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