One of the magnetic layers may be {TAIL ~ a so called granular structure} in which {HEAD ~ a magnetic material} is dispersed 
in
One of the magnetic layers may be { TAIL ~ a so called granular structure } in which { HEAD ~ a magnetic material } is dispersed
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH