is constructed of polyurethane resins containing dispersed electroconductive agents in order to better attenuate the rf energy the layer 50 is electrically grounded which is accomplished by use of a strip of electrically conductive film not shown secured to the window perimeter and the inside of the aircraft skin by conductive adhesive alternatively electrical grounding can be accomplished by overspraying of the window surround with the layer 50 material so as to establish electrical continuity in yet further alternative embodiments electrical grounding can be accomplished by other means known in the art because the layer 50 is applied to the inner surface 46 of the pane 44 it would be desirable to cover the layer 50 with a protective coating or another transparent pane in order to guard against scratches and other damage to the layer 50 in alternative embodiments however the layer 50 may be applied to the outer surface 48 of the pane 44 in which case a protective layer may not be required for those aircraft window designs that employ one or more additional panes between the outer surface 48 and the exterior of the aircraft in fig7 and 8 there is shown an aircraft window frame 56 a transparent pane.