The interplane optical spectrum of the organic superconductor kappa-(BEDT-T
TF)(2)Cu[N(CN)(2)]Br was investigated in the frequency range from 40 to 40
000 cm(-1). The optical conductivity was obtained by Kramers-Kronig analysi
s of the reflectance. The absence of a Drude peak at low frequency is consi
stent with incoherent conductivity but in apparent contradiction to the met
allic temperature dependence of the dc resistivity. We set an upper limit t
o the interplane transfer integral of t(b)(2)/t(ac)approximate to 10(-7) eV
. A model of defect-assisted interplane transport can account for this disc
repancy. We also assign the phonon lines in the conductivity to the asymmet
ric modes of the BEDT-TTF molecule.