We report on preliminary results regarding the applicability of nanostructured composite layers for electromagnetic interference shielding in the frequency range of 10-20 GHz. The layers, based on commercially available graphene nanoplatelets and ZnO nanopowder grown using a hydrothermal procedure, were found to induce quite effective attenuation of electromagnetic radiation in the frequency range 10-20 GHz of around -30 dBs, this depending on the ZnO nanopowder/graphene nanoplatelets ratio and the frequency employed. (C) 2017 Published by Elsevier B.V.