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We have measured the temperature and angular dependence of the upper critical field <inline-formula><tex-math notation="LaTeX">$({\boldsymbol B}_{\bf C2})$</tex-math></inline-formula> for three state of the art (RE)BCO HTS tapes using variable-temperature ac susceptibility measurements in applied fields up to <inline-formula><tex-math notation="LaTeX">${\boldsymbol 35}\,{\bf T}$</tex-math></inline-formula>. The three tapes measured were a Fujikura tape without artificial pinning centers and Superpower tapes with and without artificial pinning centers. We have obtained fits to our <inline-formula><tex-math notation="LaTeX">${\boldsymbol B}_{\bf C2}({\boldsymbol T},\boldsymbol{\theta })$</tex-math></inline-formula> data using both the anisotropic Ginzburg–Landau (G–L) and Klemm's models for layered superconductors. Our calculations suggest that these tapes are three-dimensional (3-D) at all temperatures in zero field but become 2-D in magnetic fields above a crossover field of <inline-formula><tex-math notation="LaTeX">$457/\boldsymbol{\gamma }$</tex-math></inline-formula> T, where <inline-formula><tex-math notation="LaTeX">$\boldsymbol{\gamma } = \sqrt {{\boldsymbol m}_{\boldsymbol c}}/{\boldsymbol m}_{\boldsymbol ab} $</tex-math></inline-formula> is the G–L anisotropy parameter. The values of <inline-formula><tex-math notation="LaTeX">$\boldsymbol{\gamma }$</tex-math></inline-formula> were measured and show that the 3-D–2-D crossover fields in these tapes are at least 130 T.

3-D Properties in (RE)BCO Tapes Measured in Fields up to 35T