A method for forming {HEAD ~ multi layered fiber} including {TAIL ~ a core}, a first layer, and a second layer 
including
A method for forming { HEAD ~ multi layered fiber } including { TAIL ~ a core } , a first layer , and a second layer
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH