In another exemplary embodiment, {HEAD ~ the groove} is formed in one of two substrates and the two substrates are laminated such that the surface of the substrate on which {TAIL ~ the groove} is formed, faces toward the other substrate 
In another exemplary embodiment , { HEAD ~ the groove } is formed in one of two substrates and the two substrates are laminated such that the surface of the substrate on which { TAIL ~ the groove } is formed , faces toward the other substrate
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH