%0 Journal Article %A C.C Chang %A X.D Wu %A Ramamoorthy Ramesh %A X.X Xi %A T.S Ravi %A T Venkatesan %A D.M Hwang %A R.E Muenchausen %A S Foltyn %A N.S Nogar %B Applied Physics Letters %D 1990 %G eng %P 1814-1816 %R 10.1063/1.104143 %T Origin of surface roughness for c-axis oriented Y-Ba-Cu-O superconducting films %V 57