Also, it should be mentioned at this point that the description that follows {HEAD ~ concentrates} on {TAIL ~ Molecular Beam Epitaxy apparatus} and methods of operation 
on
Also , it should be mentioned at this point that the description that follows { HEAD ~ concentrates } on { TAIL ~ Molecular Beam Epitaxy apparatus } and methods of operation
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH