Wiktionary
two-tier
a. 1 Having or consisting of two tiers. 2 (context labor English) Relating to the (w: two-tier system), a payroll system in which one group of workers receives lower wages and/or benefits than another.
Usage examples of "two-tier".
There was a two-tier electric fire in the cavernous bedroom my father used and an undersized convector heater in the oak panelled room where he sat at his desk in the evenings.