Systems and related methods providing for touch sensors having a waveguide reflective array within a major reflective array are discussed herein. A touch sensor may include a substrate configured to propagate surface acoustic waves. The substrate may include a front surface, a back surface including the reflective arrays, and a connecting surface joining the front surface and the back surface. The reflective arrays may be configured to cause the surface acoustic waves to propagate from the back surface, via the connecting surface, to the front surface. The touch censor may further include circuitry configured to determine a coordinate of a touch event on the front surface based on received attenuations in the surface acoustic waves.