Small‐angle x‐ray scattering (SAXS) from amorphous polycarbonate (PC) exhibits a sharp rise in intensity at ultrasmall angles (2&thgr; <0.08° for CuK&agr;radiation). At much higher angles, SAXS is superimposed on a diffuse halo centered at an angle corresponding to a spacing of[inverted lazy s]10 Å. Since doping the PC with small amounts of I2results in a reversible decrease in SAXS intensity, SAXS is not due to voids but is probably attributable to the ``nodule'' structure observed in PC with electron microscopic techniques. The invariant,∫0∞&thgr;2I(&thgr;)d&thgr;and lim[&thgr;4I(&thgr;)] as &thgr; → ∞, are used to compute a specific surface of 150 m2/cm3based on the assumption of 0.5 volume fraction of spherical nodules. The ``range of inhomogeneity'' of the nodules is then found to be 130 Å. From absolute intensity measurements the minimum relative density fluctuation between the nodules and their surroundings is 1.6%; an upper limit of 1.8% is found for fcc close packing of nodules. This result demonstrates that the model of Yeh, which assumes crystalline density for the nodules and predicts a relative density fluctuation of 21% is much too extreme.