The second part discusses both traditional and novel methods of solving the ``phase'' problem, the principal difficulty in x-ray structure determination.
This is the basis of the existence of aperiodicity manifested in the liquid crystals and also quasi-crystals also discussed in Crystallography and the World of Symmetry.
If questions remain, you also have the opportunity to ask the author on the book's website. This book invites you on a systematic tour through the fascinating world of crystals and their symmetries.
From tilings to quasicrystal structures and from surfaces to the n-dimensional approach, this book gives a full, self-contained in-depth description of the crystallography of quasicrystals.
The fourth edition of the original German text has been translated into English for an international readership. The heart of the book is firmly fixed in geometrical crystallography.