an exterior rearview mirror assembly for a motor vehicle includes a mounting bracket securable to a lateral side of a vehicle . a mirror case is secured to the mirror bracket . a primary reflector is fixedly secured to the primary portion of the backing plate . the primary reflector defines a primary field of view extending laterally away from the lateral side of the motor vehicle . a secondary reflector defines a secondary field of view extending laterally in space disposed adjacent the lateral side of the motor vehicle , wherein the secondary field of view overlaps the primary field of view in a range of 20 % to 80 %. the field of view of the secondary reflector is also directed downwardly with respect to the field of view of the primary reflector .