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2D structures (surface particles)

Particles deposited on or suspended from a surface or interface. The interference function defines how scattering from multiple particles combines.

For dilute distributions, particles scatter independently. For ordered or partially ordered systems, interference functions describe the spatial correlations.

Positioning: deposit vs suspend

2D structures can be positioned in two ways:

  • Deposit: The bottom of particles is placed at the layer’s bottom interface. Use depositParticle or deposit2D. Appropriate for particles sitting on a substrate.

  • Suspend: The top of particles is placed at the layer’s top interface. Use suspendParticle or suspend2D. Appropriate for particles hanging from below an interface, such as holes or inclusions embedded in a substrate.

Disordered particles

For uncorrelated particles on a surface:

layer.depositParticle(density, particle)
layer.suspendParticle(density, particle)

Ordered structures

For particles with spatial correlations, use structured layouts:

layer.deposit2D(structure)
layer.suspend2D(structure)

Structure types include:

  • Regular lattice: Particles at periodic positions
  • Paracrystal: Short-range order with cumulative disorder