According to one aspect, {HEAD ~ a multi layered fiber} containing a core, a first layer, and {TAIL ~ a second layer} is provided 
According to one aspect , { HEAD ~ a multi layered fiber } containing a core , a first layer , and { TAIL ~ a second layer } is provided
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH