A structure and method to establish an electrical connection between a tester and an electrical component. The surfactants are useful in the preparation of aqueous film forming foams and alcohol-resistant film-forming foams for firefighting. In one implementation, the protrusion is contoured by a dry isotropic etch having excellent selectivity, using a downstream microwave plasma etch. The target surface is maintained at a substantially constant angle of impingement and maintains a substantially fixed distance from a cathode during target motion. A conductor, for providing electricity to the interface layer comprising strands configured to be separable and electrically conductive, may be positioned in contact with the interface layer. The single turn solenoid to contain within a portion of the magnetic section and circumscribed by the magnetic section.