  We present a measurement of multiple Coulomb scattering of 1 to 6 GeV/c
electrons in thin (50-140 um) silicon targets. The data were obtained with the
EUDET telescope Aconite at DESY and are compared to parametrisations as used in
the Geant4 software package. We find good agreement between data and simulation
in the scattering distribution width but large deviations in the shape of the
distribution. In order to achieve a better description of the shape, a new
scattering model based on a Student's t distribution is developed and compared
to the data.
