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While atomic vibrations dominate thermal conduction in the amorphous and face-centered cubic phases of Ge 2 Sb 2 Te 5 , electrons dominate in the hexagonal closed-packed (hcp) phase. Here we separate the electron and phonon contributions to the interface and volume thermal resistances for the three phases using time-domain thermoreflectance and electrical contact resistance measurements. Even when electrons dominate film-normal volume conduction (i.e., 70% for the hcp phase), their contributiondoi:10.1063/1.4807141 fatcat:4kra2grihvapzbjcxf3ygseqae