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052<p type="texpara" tag="Body Text" et="abstract" >The superconductingproximity effect is measured in sandwiches of thin Pb films and the alkalimetals Cs, Rb, K and Na. The $T_{c}$-dependence provides information about theinterface barriers between Pb and the alkalis. Such a barrier is particularlylarge in Pb/Cs sandwiches. It is not due to impurities or oxydation. In thepresence of a sufficiently strong barrier a special form of the Cooper limitcan be applied to calculate the transition temperature of the sandwich

The superconducting proximity effect as a tool to investigate metal films and interfaces