The substrate has {HEAD ~ a first surface} and a second surface spaced in {TAIL ~ a predetermined interval} apart from the first surface is prepared 
The substrate has { HEAD ~ a first surface } and a second surface spaced in { TAIL ~ a predetermined interval } apart from the first surface is prepared
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH