{HEAD ~ A first conductive layer} is formed in {TAIL ~ the ring} shaped trench of the first dielectric layer 
{ HEAD ~ A first conductive layer } is formed in { TAIL ~ the ring } shaped trench of the first dielectric layer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH