With this construction, {HEAD ~ the insulation film} which is partly removed as {TAIL ~ a part} of the etched portion is formed inside the composite substrate in parallel with the main surface thereof 
is partly removed as
With this construction , { HEAD ~ the insulation film } which is partly removed as { TAIL ~ a part } of the etched portion is formed inside the composite substrate in parallel with the main surface thereof
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH