Comparative experimental study of DC breakdown strength of Polypropylene film under various layer arrangementsMatej Vaľko, Kristián Glajc, Róbert Štefko, Vladimír Szomosi, Roman Cimbala and Juraj KurimskýEPJ Web Conf., 372 (2026) 06012DOI: https://doi.org/10.1051/epjconf/202637206012