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Photoionization as a half-scattering process is not instantaneous. Usually,time delays in photoionization are of the order of few tens of attoseconds (1as = 10$^{-18}$ s). While going from a single atom to a nano-object, one canexpect the delay to increase since the photoelectron scatters over a largerdistance. Here, we show that this is no longer valid in the case of planarsystems. Using attosecond interferometry, we find that the time delay in a 2Dcarbon-based molecule, naphthalene, is significantly smaller compared to its 3Ddiamond-like counterpart, adamantane. The measured time delay carries thesignature of the spatial distribution of the hole created in the residualmolecular cation, allowing us to obtain its dimensions with angstrom accuracy.Our findings offer novel opportunities for tracking and manipulating ultrafastcharge transport in molecular materials.

Attosecond metrology of 2D charge distribution in molecules