For interphase interfaces in solids, define the interface coherence. By means of drawing sketches, describe different types of interfaces, i. e. I) Fully coherent, ii) semicoherent, iii) incoherent and iv) complex-coherent interfaces. State the differences and/or similarities between these interface types and support yolur arguments by sketches and equations. Define the precipitatiing phases in the Al-Cu binary system and state if they are coherent, semi-coherent and incoherent by providing necessary explanations. Draw sketches, if necessary