{HEAD ~ The second metal layer} is deposited over {TAIL ~ the spacer} to complete the connection between the first and second metal layers 
is deposited over
{ HEAD ~ The second metal layer } is deposited over { TAIL ~ the spacer } to complete the connection between the first and second metal layers
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH