a composite substrate formed by bonding {HEAD ~ the main surface} of a first semiconductor substrate and the main surface of a second semiconductor substrate together with {TAIL ~ an insulation film} interposed therebetween 
a composite substrate formed by bonding { HEAD ~ the main surface } of a first semiconductor substrate and the main surface of a second semiconductor substrate together with { TAIL ~ an insulation film } interposed therebetween
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH