This book focuses on methods of how to understand the relationship between the structure and physical properties of polymers from the microscopic point of view on the basis of experimental and theoretical methodologies. It is the second volume of a two volume set with Structural Science of Crystalline Polymers. The first volume of the series, “Structural Science of Crystalline Polymers: Basic Concepts and Practices” describes the details of techniques for analysis of the hierarchical structure of crystalline polymers from both the experimental and theoretical points of view. Readers of the first volume who master the concrete techniques and concepts necessary for the analysis of the structure of polymers are now invited to begin this second volume. The methods introduced in this book are useful not only for understanding the physical properties of crystalline regions but also for interpreting the bulk properties of polymer materials from the 3D structural point of view. Forthis purpose, a concrete description is provided so that readers can use the theory or the program in the actual interpretation of physical properties. The physical properties of polymers are intimately related to the structural evolution in the crystallization process and also the structural changes in the samples subjected to an external field. Concrete methods and examples are introduced for these studies, making the book a useful and practical guide for young professional researchers, including those working in industry. At the same time, it can also be used as an excellent reference for graduate-level students.