  We have observed the plasma edge in the normal state c-axis far-infrared
(far-IR) reflectivity of La2-xSrxCuO4 (LSCO) single crystals at an unlikely
Sr-doping concentration x = 0.07 but not in x = 0.09. We find that the c-axis
scattering rate (Gc) is surprisingly small, Gc = 13 (+_) 2 cm-1 for x = 0.07
and Gc = 24 (+_) 1 cm-1 for x = 0.09 and nearly temperature independent but
increases linearly with doping up to x = 0.16. We suggest that the apparent
absence of the normal state plasma edge in the previous measurements is due to
the larger Gc than the screened plasma frequency of the coherent free carriers.
We conclude that the c-axis charge transport in LSCO in the underdoped regime
is intrinsically coherent.
