The LPMOCVD technique has been successfully used to grow heterojunctions and superlattices of Ga//xIn//1// minus //xAs//yP//1// minus //y lattice-matched to InP for the complete compositional range between InP ( lambda equals 0. 91 um, Eg equals 1. 35 eV) and the ternary compound Ga//0//. //4//7 In//0//. //5//3 As ( lambda equals 1. 67 um, Eg equals 0. 75 eV). Authors have observed Shubnikov-de Haas oscillations in heterojunctions and superlattices of Ga//0//. //4//7 In//0//. //5//3 As-InP and Ga//0//. //2//5In//0//. //7//5As//0//. //5 P//0//. //5 - InP showing evidence of two-dimensional behaviour.