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(Received December 24, 1999)
The c-axis penetration depth c in Bi2Sr2CaCu2O8 + (BSCCO) single crystals as a function of temperature has been determined using two techniques, namely, measurements of the ac-susceptibility at a frequency of 100 kHz and the surface impedance at 9.4 GHz. Both techniques yield an almost linear function c(T) T in the temperature range T < 0.5Tc. Electrodynamic analysis of the impedance anisotropy has allowed us to estimate c(0) 50 mm in BSCCO crystals overdoped with oxygen (Tc 84 K) and c(0) 150 mm at the optimal doping level (Tc 90 K).
PACS: 74.72.Hs, 74.25.Ha