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