Table 4.1Extinction distance for prominent lattice planes in alminium and gold at 100kV. Material Extinction distance for reflection hk/(nm) S=0 110 111 200 220 400 N Au 二 56.3 68.5 473 76.4 period 18.3 20.2 27.8 43.5 =11s2+/5g)-5o Seff t=6*tperiod=6g (a) 200nms = 0 t period= 1 𝑠𝑒𝑓𝑓 = 1/ 𝑠 2 + (1/𝜉𝑔 2 ) = 𝜉𝑔 t=6* t period = 6 𝜉𝑔 𝜉𝑔