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