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