This is a rigid flex circuits (total thickness: 1.5mm of the rigid part). On the quadrilateral side, the PCB has two layers, the outer part has only one upper layer, and a stiffener on the bottom, please see the illustration below. See proposed layer-stack-up in the attached file.
Rigid flex circuits are the perfect solution if multiple rigid PCBs need to be electrically connected in various installation positions and orientations. The rigid-flex circuits technology is extremely versatile with regard to layout options and geometries and has therefore become an indispensable part of modern connection solutions.
Here at Hemeixinpcb, we`ve been committed to manufacturing high precision printed circuit boards and rigid-flex circuits for nearly 15 years. The combined experience of our management, and manufacturing engineers, along with our state-of-the-art manufacturing tools provide the perfect recipe for success. We work closely with our customers from the beginning to ensure that their PCB and rigid-flex circuits will not only satisfy all of their requirements, but will convince them to choose Hemeixinpcb for all of their future PCB and rigid-flex circuits needs.