  We present high-resolution thermal-expansion and specific-heat measurements
of single crystalline alpha-RuCl3. An extremely hysteretic structural
transition expanding over 100 K is observed by thermal- expansion along both
crystallographic axes, which we attribute to a change of stacking sequence of
the RuCl3 layers. Three magnetic transitions are observed, which we link to the
different stacking sequences. Using our data and thermodynamic relations, we
derive the uniaxial and hydrostatic pressure derivatives of all three magnetic
transitions. Our results demonstrate that magnetic order should be totally
suppressed by very moderate pressures of 0.3 GPa to 0.9 GPa. Finally, we
discuss why our results differ from recent hydrostatic pressure measurements
and suggest a possible route to reaching the spin-liquid state in alpha-RuCl3.
