In many cases electrochemical processes such as metal electrodeposition, roughness relaxation and metal corrosion develop self-affine fractal surfaces rather euclidean surfaces due to the presence of non-equilibrium conditions. When this type of surface is formed thermodynamic models can not be strictly applied. The roughness and growth exponents obtained by the dynamic scaling applied to STM imaging give relevant information about processes operating during the interface evolution. Advances in the development of theoretical models related to non-equilibrium growth processes are needed to attain a more complete description of this type of processes.

Acknowledgment. This work was finacially supported by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) of Argentina.

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