  The magnetic structure of Ce0.9La0.1RhIn5 is measured using neutron
diffraction. It is identical to the incommensurate transverse spiral for
CeRhIn5, with a magnetic wave vector q_M=(1/2,1/2,0.297), a staggered moment of
0.38(2)Bohr magneton per Ce at 1.4K and a reduced Neel temperature of 2.7 K.
