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Hi Suhaili, if the detectors are equal by couples, you can simply define them as a separate couple of solids (boxes?), and place them twice (G4PVPlacement) with simple +- displacements along X and Y respectively. If the detectors are all equal, you can define a single solid (box?) and place it 4 times (G4PVPlacement), twice with +- displacement along X and twice with rotation of 90 degrees around Z and +- displacement along Y. It's a very simple exercise I suggest you to do it yourself. Examples on how to use transformations can be found in many examples provided in Geant4. Cheers, Gabriele