  We have studied the transport properties of TEM lamellae obtained from a
pyrolytic graphite sample with electrical contacts at the edges of the embedded
interfaces. The temperature dependence of the resistance as well as the
current-voltage characteristic curves are compatible with the existence of
Josephson coupled superconducting regions. The transition temperature at which
the Josephson behavior sets in, decreases with the interface width and vanishes
for width below 200~nm. This unexpected behavior is apparently due to the
influence of weak localization effects on the superconducting critical
temperature.
