We considered this topic above, in the First level chapter, Sectphsh1. Now we continue to discuss this phenomenon. It is known from long ago; however, problems associated with the phase shift in different areas remain actual nowadays. We here refer to a few of many phase-shift-related publications. In particular, the shift appears in various light systems, even in the simplest case of the reflection at an inclined mirror, Creath and Schmit (2005); Hyun and Zhang (2016). And in optical communications, Jawla and Singh (2013). It is also known in medicine, Deacon and Arendt (1995). The phase shift transformation methods are discussed in Verboomen et al. (2005) and Cano et al. (2017). In this respect, mechanical waves (elastic waves in piezoelectric crystals) were considered in Alshits et al. (1984). This phenomenon is also studied in Slepyan (2022a).