“…The fabrication process of a high-quality thin film was one of the major research works for the application goal of this high- T c film (Cieplak et al , 1994; Liang et al , 1995; Geerk et al , 2001). After many years, the study of monolayer film has been moving toward maturity, and many research works have turned to building heterogeneous structures, such as the p–n junction (Xiang et al , 2007; Shi et al , 2008; Guo et al , 2009; Chen et al , 2010; Yin et al , 2010). Besides results on building a heterogeneous structure, recently also results on preparing bilayers or multilayer films using different doped LSCO materials and studying the interaction between the films were reported (Caviglia et al , 2008; Ueno et al , 2008; Biscaras et al , 2010; Koren and Millo, 2010; Rout and Budhani, 2010; Bollinger et al , 2011).…”