“…Firstly, we show that the spectrum of in-plane waves in laminates exhibits exceptional points, accessible in a purely elastic setting. Exceptional points are states of a system at which two (or more) of its normal modes coalesce, together with their natural frequencies (Moiseyev andFriedland, 1980, Ding et al, 2015), and are the source of counterintuitive phenomena such as enhanced sensitivity, wave stopping and asymmetric transmission (Hodaei et al, 2017, Achilleos et al, 2017, Goldzak et al, 2018, Merkel et al, 2018. Exceptional points occur only in non-Hermitian systems (Moiseyev, 2011), a property which usually describes systems that interact with the environment.…”