Locating-2-Dominating Set is denoted as R2D(G), and in this chapter the Location-2-domination number for direct and Cartesian product of graphs, namely P n □ P m , P n □ S m , P n □ W m , C n □ C m , P n × P m , P n × S m , C n × P m , C n × C m , are being found. © Springer Nature Switzerland AG 2019.