How can I obtain an international PhD mention?

The title of Doctor may include the "International Doctor" mention, providing the following circumstances are satisfied:

During the period of training required to obtain the doctoral degree, the doctoral candidate must have spent a minimum of three months outside Spain in a prestigious higher education institution or research centre, studying or carrying out research work. The stay and the activities must be endorsed by the director and authorised by the Academic Committee, and will be incorporated into the doctoral student's activities record.
That part of the doctoral thesis, at least the summary and conclusions, has been written and presented in one of the usual languages for scientific communication in its field of knowledge, different from any of the official languages in Spain. This rule will not apply when stays, reports and experts come from a Spanish-speaking country.
The thesis must have been reported by a minimum of two expert doctors belonging to a non-Spanish higher education institution or research institute.
That at least one expert (holding the title of doctor) belonging to a non-Spanish higher education institution or research centre, and other than the person responsible for the stay mentioned in section a), has formed part of the evaluation tribunal of the thesis