“…Flexible strain sensors are in high demand in many areas of technology, such as biomedicine and healthcare (blood flow pulsation sensors [ 1 ], respiration detection [ 2 ], limb movement monitoring [ 3 ], muscle signal studies [ 4 ], electronic skin [ 5 ], etc.) machines [ 6 ], soft robotics [ 7 ], interactive games [ 8 ], and virtual reality [ 9 ], as well as various industrial applications (for example, wind pressure control sensors [ 10 ], piezotronic strain sensors for transistors [ 11 ], etc.). The high interest in the development of flexible sensors is due to their (1) large elongation, which allow them to be used for registering deformation in both low and large ranges, and (2) softness, which leads to a potentially simpler integration with the human body, and also makes it possible to solve the problem of rigidity and bulkiness of structures.…”