  We show that classical chromomagnetic fields produced coherently in the
initial stage of a heavy-ion collision exhibit screening. From the two-point
field strength correlator we determine the magnetic mass for SU(2) to be m ~ 5
times the saturation scale. Magnetic screening leads to an intuitive
understanding of the area law scaling of spatial Wilson loops observed
previously. The presence of screening effects in the initial state provides a
basis for defining kinetic processes in the early stage of heavy-ion
collisions, with electric and magnetic masses of the same order.
