  We addressed the issue of the absence of the far-infrared signatures
pertaining to charge ordering in the published far-infrared reflectivity data
of La2-xSrxCuO4 single crystals while other experimental probes unravel that
charge ordering is a hallmark of the superconducting cuprates. Through direct
comparison of the far-infrared data reported by various groups side by side and
also with the Raman scattering data, we found that the inconsistencies stem
from the failure in capturing delicate spectral features embedded in the
close-to-perfect ab-plane far-infrared reflectivity of La2-xSrxCuO4 single
crystals by misidentifying the reflectivity as the Drude-like metallic
reflectivity. The analysis of the close-to-true reflectivity data reveals that
only a small fraction (< 3 %) of the total doping-induced charge carriers
(electrons) are itinerant on the electron lattice made up with the rest of the
electrons (> 97 %) at all doping levels up to 16 %. We conclude that the
far-infrared reflectivity study is far from being ready to construct a coherent
picture of the ubiquitous charge ordering phenomenon and its relationship with
the high Tc superconductivity.
