A barrier layer is formed that extends over the core region and {TAIL ~ a pre metal dielectric film} is formed that extends over {HEAD ~ the barrier layer} 
A barrier layer is formed that extends over the core region and { TAIL ~ a pre metal dielectric film } is formed that extends over { HEAD ~ the barrier layer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD