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The different variants of two-stage random sequential adsorption (RSA) modelsfor packing of disks and discorectangles on a two-dimensional (2D) surface wereinvestigated. In the SD model, the discorectangles were first deposited andthen the disks were added. In the DS model, the disks were first deposited andthen discorectangles were added. At the first stage the particles weredeposited up to the selected concentration and at the final (second) stage theparticles were deposited up to the saturated (jamming) state. The mainparameters of the models were the concentration of particles deposited at thefirst stage, aspect ratio of the discorectangles $\varepsilon$ (length todiameter of ratio $\varepsilon=l/d$) and disk diameter $D$. All distances weremeasured using the value of $d$ as a unit of measurement of linear dimensions,the disk diameter was varied in the interval $D \in [1-10]$, and the aspectratio value was varied in the interval $\varepsilon\in [1-50]$. Thedependencies of the jamming coverage of particles deposited at the second stageversus the parameters of the models were analyzed. The presence of firstdeposited particles for both models regulated the maximum possible diskdiameter, $D_{max}$ (SD model) or the maximum aspect ratio, $\varepsilon_{max}$(DS model). This behavior was explained by the deposition of particles in thesecond stage into triangular (SD model) or elongated (DS model) pores formed byparticles deposited at the first stage. The percolation connectivity of disks(SD model) and discorectangles (DS model) for the particles with a hard coreand a soft shell structure was analyzed. The disconnectedness was ensured byoverlapping of soft shells. The dependencies of connectivity versus theparameters of SD and DS models were also analyzed.

Two-stage random sequential adsorption of discorectangles and disks on a two-dimensional surface