The spacer is preferably tapered and the via may include a glue layer to improve {HEAD ~ the adherence} of {TAIL ~ the spacer} to the dielectric layer 
of
The spacer is preferably tapered and the via may include a glue layer to improve { HEAD ~ the adherence } of { TAIL ~ the spacer } to the dielectric layer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH