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The aim of this work is to determine a joule heating prediction model for thick copper/Low-k interconnects on glass substrate technology. Experiments and simulations have been used to define thermal conductivities of our stack material from thermal resistance study. In a second time, the thermal resistance is used as quantitative response to predict the joule temperature in the strip. The experimental Rthermic results are well fit with a quadratic model which combined with the thermal coefficient of resistance formalism; allow us to define an analytical temperature joule heating formula. This methodology to define an analytical joule heating formula can be widely used to determine the maximum operating conditions and can be implemented in design rules manuals.