Send the following on WhatsApp
Continue to ChatElementary considerations led me to the conclusion that a medium, composed of layers of different dielectric constants, must behave as a uniaxial crystal if it is assumed that the layer thicknesses are only a fraction of a wave-length. - Karl Ferdinand Braun from https://whatsmyquote.com/quote/elementary-considerations-led-me-to-the-conclusion-that-a-medium-composed-of-layers-of-different-dielectric