Neutron scattering experiments were performed on the single-crystalline DyB2C2 under magnetic fields in order to elucidate the magnetic structures of field-induced phases. The measurements in the a*-c* reciprocal lattice plane under the magnetic fields along the  direction resulted in finding a new magnetic reflection of 1 0 3/4 in a field-induced phase (phase II″) in addition to the magnetic reflections that are common to those in the phase under a zero magnetic field (phase III). The magnetic unit cell in phase II″ has dimensions of axax4c, where all the Dy magnetic moments on the AFQ structure have advantageous directions to the magnetic field, and their AFQ couplings with the neighbouring moments along the c-axis are partly broken. This magnetic structure model for phase II″ well explains the magnetisation process at 5K up to 14 T.
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