There are some articles about the rigid-flex circuit. It is divided into three parts: Design, technology and material datasheet. You can look up the references for your requirements. If you have any additions to the list, please let us know.
DESIGN
Würth Elektronik GmbH & Co. KG Circuit Board TechnologyFlex-Rigid Design Guide V1.0
Altium Designer Flex and Rigid-Flex Printed Circuit Design
http://techdocs.altium.com/display/ADOH/Flex+and+Rigid-Flex+Printed+Circuit+Design
TECHNLOGY
Minco Flex circuit solution
http://www.minco.com/components/Home/Flex-Circuits
Multi-CB Flex-rigid PCB
https://www.multi-circuit-boards.eu/en/products/printed-circuit-boards/rigid-flex-pcb.html
Multi-CB Printed circuit board surfaces
https://www.multi-circuit-boards.eu/en/pcb-design-aid/surface/surfaces.html
AT&S Product Information “Rigid – Flexible PCBs”
Flexible Circuit Technologies Rigid Flex
http://www.flexiblecircuit.com/product-category/rigid-flex/
Fjelstad, Joseph (2007). Flexible Circuit Technology, Third Edition
http://read.pudn.com/downloads157/ebook/699595/Flexible-Circuit-Technology-3rd-3.pdf
EPEC FLEX & RIGID-FLEX CIRCUITS
MATERIAL DATASHEET
Multi-CB Printed circuit board materials(datasheet attached)
https://www.multi-circuit-boards.eu/en/pcb-design-aid/pcb-materials.html
Pyralux Pyralux®flexible circuit materials(datasheet attached)
Minco Rigid flex parameters
http://www.minco.com/components/Home/Flex-Circuits/Product-Technologies/Rigid-Flex