Selfinduced moving and zerovelocity(ZV) gap solitons were studied in a resonantly absorbing Bragg reflector of finite atomic width. Numerical results showed that the existence of moving gapsoliton is in general not affected by the finite atomic width but the existence of the ZV gapsoliton is highly affected by the widths of the atomic layers. Thus the trapping of the photonic energy occurs only in very thin atomic layers arranged with Bragg periodicity.