{HEAD ~ The surface side reproduction type optical recording medium} 4, wherein {TAIL ~ the refractive index} of the dielectric layer decreases stepwisely or continuously toward the medium surface 
wherein
{ HEAD ~ The surface side reproduction type optical recording medium } 4 , wherein { TAIL ~ the refractive index } of the dielectric layer decreases stepwisely or continuously toward the medium surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH