In this proposal we want to clarify the magnetic structure on Yb(Rh(1-x)Cox)2Si2 by means of single neutron diffraction on SXD. In previous experiments we identified the magnetic order for x>0.58 and x=0.58, but could not detect magnetic intensity for lower Co concentrations. We propose to measure on a single crystal with a Co content of 27%, which seems to be a suitable concentration due to a high ordering temperature of 1.7 K and connected with that an expected high ordered moment. Therefor it should be feasable to observe magnetic reflections in Yb(Rh0.73Co0.27)2Si2 by neutron diffraction. The proposed measurement will pave the way for an understanding of the magnetic order in the parent compound YbRh2Si2, a heavy-fermion system located at a quantum critical point.