Embodiments include an apparatus, device, system, computer-program product, and method. The precursor solution is coated onto the substrate as a continuous liquid phase. In a preferred embodiment, a non-ketone polar solvent is also employed. In one alternative aspect of the invention, the switch at the switch-out end of the waveguide resonator is a plasma switch, employing at least one dielectric window positioned in the resonator guide to have minimum effect on the resonator Q. The protrusion is disposed on the first or second contact surface.