In this construction, the sampler 1″ includes a top ply 3″ and {HEAD ~ a bottom ply} 5″ having {TAIL ~ upper and lower surfaces} 3 a″,5 a″ and 3 b″, 5 b″, respectively 
In this construction , the sampler 1″ includes a top ply 3″ and { HEAD ~ a bottom ply } 5″ having { TAIL ~ upper and lower surfaces } 3 a″,5 a″ and 3 b″ , 5 b″ , respectively
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH