TY - JOUR AU - Y. An AU - Steven Cundiff BT - Journal of Applied Physics DA - 2004 DO - 10.1063/1.1768617 PY - 2004 EP - 2638 T2 - Journal of Applied Physics TI - Effect of ultrathin Cr layers on surface second-harmonic generation from Cr-SiO[sub 2]-Si(001) structures VL - 96 SN - 00218979 ER -