An interface article for attenuating electromagnetic frequency radiation includes a multiple-layer construction with a first layer having a low index of refraction, and a second layer having a high index of refraction. The article includes ceramic fillers, metallic fillers, graphite fillers, or combinations thereof dispersed in a polymeric matrix. The interface article is tunable to exhibit at least 75% reduction of reflection of incident electromagnetic radiation at a target frequency of between 0.3-100 GHz.