A method for preparing and treating the surfaces of structural components, such as structural aircraft wing and fuselage skin panels, spar, spar assemblies, ribs, stiffeners, hinges, doors, etc. Another aspect of the invention relates to an integrated circuit which includes a copper interconnect, a dielectric material and the copper diffusion barrier. A visitor path record is maintained that corresponds to at least one visitor in the visitor list by recording information about web pages that a visitor accesses. The diffractive bodies are dimensioned on the same order of magnitude as the wavelength of the light of the reference laser beam of light. The alignment of the circuit permits multiple characteristics of the circuit to be calibrated.