A method of reducing multipactor effect occurrence on surfaces in a high energy field, e.g., RF devices, is provided and RF devices having a configuration produced by the method are provided. The method includes forming wall structures formed of a metallic wall material and defining a channel through which the RF energy travels, the wall material having a wall material surface. A porous layer is disposed over the wall material surface and has a porous layer upper surface opposite a porous layer lower surface facing the wall material surface. The porous layer defines pores with openings distributed in the porous layer upper surface. A conductive layer is disposed over the porous layer upper surface.