MBE apparatus and methods are employed for disclosure purposes only because that is the equipment employed by the inventors herein in {HEAD ~ their experiments} that lead to {TAIL ~ the present invention} 
lead to
MBE apparatus and methods are employed for disclosure purposes only because that is the equipment employed by the inventors herein in { HEAD ~ their experiments } that lead to { TAIL ~ the present invention }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL