PostStepDoIts are invoked only if the corresponding GetPhysicalInteractionLength method returns the minimum value, or corresponding forced flag is set.
AtRestDoIts are invoked at the point where G4SteppingManager finished one step and all changes by the 'AlongStepDoIt' are applied to G4Track including the particle relocation and the safety update..
G4Track will be updated each time after the invocation of a 'PostStepDoIt'. This is contrast to the 'AlongStepDoIt case.
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