A series of high quality delta-doped In-0.53,Ga0.47As samples have been grown lattice matched to InP with design doping densities in the range 2 x 10(12) to 5 x 10(12) cm(-2). Analysis of the individual sub-band densities deduced from the Shubnikov-De Haas effect shows that both spreading and amphoteric behaviour increase with doping density.