Theoretical powder X-ray diffractogram for the 2D α structure simulated from the single crystal data of Prα (green). Experimental powder X-ray diffraction pattern obtained for the bulk FigusFarimegup3rl.eeT3ph. rTeeohpreaeortreiedctaiclbapyl opdwowirdedecertrXmX--rirxaaiyyngddiifoffffrr...