  Two converging and superimposing shock and Rayleigh waves are generated on a
glass substrate by focusing laser pulses on two concentric rings in a bullseye
configuration (67\mm~and 96\mm~radii). We study experimentally the threshold
for substrate damage as a function of the number of repetitions and the delay
(0-20\,ns). The bullseye focusing experiments are compared to a single focusing
ring. Additionally, fluid-structure interaction simulations using a
Volume-of-Fluid framework are utilized to estimate the stresses. The lowest
number of repetitions to attain surface damage is found for constructive
superposition of the Rayleigh waves, i.e., here for a delay of $10\,$ns. The
observed damage is consistent with the simulations where the largest positive
stresses ($\sim 5.6\,$GPa) are achieved for bullseye focusing with \dt =
10\,ns, followed by \dt= 20\,ns which corresponds to simultaneous shock wave
focusing. In all these cases, the positive stresses are followed (a few
nanoseconds later) by negative stresses that can reach $\sim-6.4\,$GPa.
