TY CONF TI THE INFLUENCE OF SUBSTRATE ON THE REFLECTIVE AND TRANSMISSIVE PROPERTIES OF A TWO-LAYER CONDUCTING STRUCTURE KW wave propagation KW multi-layer structure KW shungite. JO XXIV international conference "Electromagnetic field and materials (fundamental physical research)" AU Antonets, I.V. AU Golubev, E.A. AU Shavrov, V.G. AU Scheglov, V.I. PY 2025 PB INFRA-M Academic Publishing LLC.